Charles maschmeyer



(No Model.)

` G..MASCHMBYER.

LAMP STANDARD No. 406,107. PatentedJuly 2,1389.

mechanism'.

UNITED STATES PATENT OFFICE.

CHARLES MASCHMEYER, OF MERIDEN, CONNECTICUT, ASSIGNOR TO EDI/VARD MILLER & COMPANY, OF SAME PLACE.

LAM P-STAN DARD.

SPECIFICATION forming part of Letters Patent No. 406,107, dated July 2, 1889.

Application tiled December 29, 1888l Serial No. 294,967. (No model.)

To aZZ whom it may concern:

Be it known that I, CHARLES MAscHMEYER, a citizen of the United States, residing at Meriden, New Haven county, Connecticut, have invented an Improvement in Lamp-Standards, of which the following is a specification.

My invention relates to that class of standards for the support of a lamp or other article in which a tube or rod telescopes or slides wit-hin a larger tube, and is intended to provide simple and convenient means for securely maintaining said tube or rod at. any desired elevation.

In the accompanying drawings, Figures l and 2 represent in elevation modifications of my device, a part of the outer tube and casing in each broken .away to show the interior Figs. 3 and 4 are perspective views of the sleeve and clamp, respectively, as shown in Fig. l.

Similar letters refer to like part-s in the several views.

B designates an outer tube; C, a casing; c, a bearing in the casing C; D, an inner` tube or rod; d, a longitudinal groove in the tube D; E, a lamp; F, a sleeve; f, an internal rib in the sleeve F; f', a trunnion; G, a clamp; g, an arch or V-shaped saddle; g', a pivot or hinge on which the clamp G may turn; g, an annular groove or recess in the clamp G; H, va spring.

In the example of my invention shown in` Fig. 1 of the drawings the construction and operation are as follows: 4

The outer tube B is vertically supported on an ordinary base X, and has at its upper end the casing C. The inner tube or rod D, atthe top of which is secured the lamp E, is of a size to pass freely through the casing C and into the tube B, and is formed with one or` rod D, is a sleeve F, (shown separately in Fig.

3,) provided with an internal rib or ribs f, adapted to` engage with the groove or grooves d. The rod D is free as to longitudinal movement through the sleeve F, while they are locked together as to rotary movement. The sleeve F is also provided with one or more projecting hubs or trunnions f; also, within the casing C and surrounding the rod D is the clamp G, (shown separately in Fig. 4,) pivoted at g to the lug c of the casing C, provided with the arch or saddle g', adapted to ride upon the hub f, and formed with an annular depression or recess g. The springH is also within the casing C, and arranged to press downward the sleeve F and clamp G.

The operation of my pres( nt device is similar to that of the device for which I have obtained Letters Patent of the United States,

No. 866,014, dated July A5, 1887. The inner rod D is normally supported by the clamp G bearing against its opposite sides. The clamp G, being pivoted at g and free for limited rotation in a vertical plane, drops by its own weight into an engaging position with the rod D, as shown in the drawings. It may be assisted in so doing by the downward pressure of the spring I-I. When the rod D is lifted sufficient friction is developed between the rod and the clamp G to raise the latter out of frictional engagement with the rod, thus permitting the rod to be freely raised. When it is desired to lower the rod D, it is necessary it has been rotated, so as to raise the clamp G by means of the saddle g and hub or trun` nion f. Vhen the 'rod D is released bythe operator, the clamp G is forced by gravity and by the spring H to its normal position and the Yfurther descent of the rod D arrested. In practice it is advantageous to provide two grooves CZ, ribs f, trunnions f', and saddles g on opposite sides of the rod D. The sleeveF is here shown as supported in the clamp G and capable of slight longitudinal motion.

It will be seen that the sleeve F normally rests on that side of the clamp G nearest the pivot g', the clamp beinginclined downward so as to engage with the rod D. When the IOU rod D is given a partial rotation and the clamp G raised out of engagement. with the rod, as described, the sleeve F is also slightly raised. lVhen the descending' rod D is per mitted to return to its normal position, the friction between the rod and the sleeve F assists in forcing the clamp G down to its engaging position.

In Fig. 2 I have shown a modification of my device in which the sleeve F is provided with an inverted arch or saddle g and the clamp Gwith a hub f. The operation ol' the device is not affected by this modification, so that it will be unnecessary to redescribe it.

It will be seen that my present invention is an improvement on that shown in the patent above referred to, No. 366,014, dated July 5,1887. In the present device I have sim plitied and cheapened the construction by omitting the fixed support for the sleeve or ring, beside rendering the clamp adaptable to much greater variations in the size ot' the inner tube or rod: In practice it is lfound that thesevariations are considerable, and that my present device, which only limits the downward movement of the clamp by the size of the tube which it engages, is much more reliable.

I d-o not wish to be understood as elaimiug anything claimed or described in said former patent.

Ihat I claim, and desire to secure by Iletters Patent of the United States, is as follows:

l. In a standard fora lamp o1' otherarticle, the combination of an outer tube, an inner telescoping tube or rod, a clamp normally engaging with said inner rod, and a sleeve on said inner rod fixed as to rotary motion thereon and supported as to longitudinal motion by said clamp, said sleeve and said clamp being provided one with a projecting hub, the other with a saddle-shaped portion, whereby under the rotation of said sleeve said clamp may be freed from engagement with said inner rod, substantially as described.

2. In a clamping device adapted to engage an inner telescoping tube or rod, the combination of a clamp adapted to lock said inner rod against longitudinal motion, and a sleeve supported by said clamp and adapted to receive rotary motion from the axial rotation of said inner rod, said clamp and said sleeve being provided one with a proj ectiu g hub, the other 'with a saddle-shaped portion, whereby under the rotation of said sleeve ysaid clamp may be freed from engagement with said inner rod, substantially as described.

CITAS. MASCHMEYER. Witnesses:

GEO. L. COOPER, I. B. MILLER. 

